Here is the important Multiple Choice Questions on the Cell Cycle and Mitosis
Which phase of the cell cycle involves DNA replication? a) G₁ phase b) S phase c) G₂ phase d) M phase Answer: b) S phase
During which phase does the cell grow and perform normal functions? a) G₁ phase b) G₂ phase c) S phase d) M phase Answer: a) G₁ phase
What happens during the G₂ phase of the cell cycle? a) DNA is replicated b) The cell divides c) The cell prepares for mitosis d) The cell exits the cycle Answer: c) The cell prepares for mitosis
What is the role of the G₀ phase in the cell cycle? a) DNA replication b) Resting phase for non-dividing cells c) Preparation for mitosis d) Cell division Answer: b) Resting phase for non-dividing cells
In which stage of mitosis do chromosomes align in the middle of the cell? a) Prophase b) Metaphase c) Anaphase d) Telophase Answer: b) Metaphase
During which stage of mitosis do sister chromatids separate and move to opposite poles? a) Prophase b) Metaphase c) Anaphase d) Telophase Answer: c) Anaphase
Which of the following structures forms during prophase? a) Spindle fibers b) Cell plate c) Cleavage furrow d) Centrioles duplicate Answer: a) Spindle fibers
What occurs during telophase? a) Chromosomes condense and become visible b) Sister chromatids are pulled apart c) Chromosomes decondense, and the nuclear envelope reforms d) The cytoplasm divides Answer: c) Chromosomes decondense, and the nuclear envelope reforms
Which of the following checkpoints ensures proper DNA replication? a) G₁ checkpoint b) G₂ checkpoint c) Spindle assembly checkpoint d) M checkpoint Answer: b) G₂ checkpoint
What is the main role of cyclins in the cell cycle? a) To repair DNA damage b) To regulate the progression of the cell cycle c) To form the spindle fibers d) To break down the nuclear membrane Answer: b) To regulate the progression of the cell cycle
What is the primary reason for uncontrolled cell division in cancer? a) Overproduction of spindle fibers b) Loss of regulation at cell cycle checkpoints c) Faulty DNA replication d) Delayed mitosis Answer: b) Loss of regulation at cell cycle checkpoints
Which of the following processes requires mitosis? a) Formation of gametes b) Asexual reproduction in bacteria c) Growth and tissue repair d) Genetic variation Answer: c) Growth and tissue repair
How does cytokinesis differ between plant and animal cells? a) Plant cells form a cleavage furrow, while animal cells form a cell plate. b) Animal cells form a cleavage furrow, while plant cells form a cell plate. c) Both plant and animal cells form a cleavage furrow. d) Both plant and animal cells form a cell plate. Answer: b) Animal cells form a cleavage furrow, while plant cells form a cell plate.